问题
解答题
若x2-3x+1=0,求: (1)x+
(2)x2+
|
答案
(1)∵x2-3x+1=0,
∴x≠0,
∴x-3+
=0,1 x
∴x+
=3;1 x
(2)x2+
=(x+1 x2
)2-21 x
=32-2
=7.
若x2-3x+1=0,求: (1)x+
(2)x2+
|
(1)∵x2-3x+1=0,
∴x≠0,
∴x-3+
=0,1 x
∴x+
=3;1 x
(2)x2+
=(x+1 x2
)2-21 x
=32-2
=7.